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Laboratorial study of virtual planning accuracy on orthognatic surgery

Grant number: 17/11509-2
Support type:Regular Research Grants
Duration: October 01, 2017 - September 30, 2019
Field of knowledge:Health Sciences - Dentistry - Oral and Maxillofacial Surgery
Principal Investigator:Alexandre Elias Trivellato
Grantee:Alexandre Elias Trivellato
Home Institution: Faculdade de Odontologia de Ribeirão Preto (FORP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil
Assoc. researchers:Cassio Edvard Sverzut ; Guilherme Spagnol ; Maysa Nogueira de Barros Melo

Abstract

Success of corrective surgery for dentofacial deformity depends on adequate treatment planning (based on precise diagnosis) and not only on the employed surgical technique. Surgical guides are important in this case, since they will transfer the information of surgical planning to the surgical act and allow the surgeon achievement of the movement and the new planned positions of maxilla and / or mandible, to correct the patient´s dentofacial deformity. Thus, preparation of surgical guides assumes great importance on treatment success, being the focus of this work. It will be selected eight patients previously submitted to Orthognathic Surgery and each patient will consist on one group, according to the maxillary movement. Group 1 (advancement), Group 2 (upper repositioning of incisor - URI), Group 3 (upper repositioning of molars - URM), Group 4 (midline changing), Group 5 (down repositioning of incisors - DRI) Group 6 (down repositioning of molars - DRM), Group 7 (advancement with URI and DRM) and Group 8 (advancement with DRI and URM). Two amounts of movement will be planned: 3 and 6 mm. Dolphin Imaging 11.9® virtual planning software needs importing image of computed tomographic examination and scanning of maxillary dental arches models. Simulation of 3D virtual surgery will be performed and virtual surgical guides obtained, which will be exported to the 3D printer (resin impression). In semi-adjustable articulator (SAA) the maxillary model will be separated from the SAA mounting platform and the surgical guide will be used to reassemble the maxillary model linked to mandible gypsum model (positioned according to facial bow and preoperative registration). The maxilla will be fixed in the new position and transferred to Erickson's table, in which measurements will be made to verify the planned movement (direction and amount of movement). Data will be tabulated and submitted to statistical analysis by unpaired single T test (with d 0.05). (AU)